1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  MEN 14F021P00 Board Management Controller (BMC) Watchdog Driver.
11 #include <linux/watchdog.h>
30 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
42 	rst_rsn = i2c_smbus_read_byte_data(data->i2c_client, BMC_CMD_RST_RSN);  in menf21bmc_wdt_set_bootstatus()
47 		data->wdt.bootstatus |= WDIOF_CARDRESET;  in menf21bmc_wdt_set_bootstatus()
49 		data->wdt.bootstatus |= WDIOF_EXTERN1;  in menf21bmc_wdt_set_bootstatus()
51 		data->wdt.bootstatus |= WDIOF_EXTERN2;  in menf21bmc_wdt_set_bootstatus()
53 		data->wdt.bootstatus |= WDIOF_POWERUNDER;  in menf21bmc_wdt_set_bootstatus()
62 	return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_ON);  in menf21bmc_wdt_start()
69 	return i2c_smbus_write_byte_data(drv_data->i2c_client,  in menf21bmc_wdt_stop()
74 menf21bmc_wdt_settimeout(struct watchdog_device *wdt, unsigned int timeout)  in menf21bmc_wdt_settimeout()  argument
80 	 *  BMC Watchdog does have a resolution of 100ms.  in menf21bmc_wdt_settimeout()
81 	 *  Watchdog API defines the timeout in seconds, so we have to  in menf21bmc_wdt_settimeout()
84 	ret = i2c_smbus_write_word_data(drv_data->i2c_client,  in menf21bmc_wdt_settimeout()
85 					BMC_CMD_WD_TIME, timeout * 10);  in menf21bmc_wdt_settimeout()
89 	wdt->timeout = timeout;  in menf21bmc_wdt_settimeout()
98 	return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_TRIG);  in menf21bmc_wdt_ping()
116 	struct device *dev = &pdev->dev;  in menf21bmc_wdt_probe()
119 	struct i2c_client *i2c_client = to_i2c_client(dev->parent);  in menf21bmc_wdt_probe()
123 		return -ENOMEM;  in menf21bmc_wdt_probe()
125 	drv_data->wdt.ops = &menf21bmc_wdt_ops;  in menf21bmc_wdt_probe()
126 	drv_data->wdt.info = &menf21bmc_wdt_info;  in menf21bmc_wdt_probe()
127 	drv_data->wdt.min_timeout = BMC_WD_TIMEOUT_MIN;  in menf21bmc_wdt_probe()
128 	drv_data->wdt.max_timeout = BMC_WD_TIMEOUT_MAX;  in menf21bmc_wdt_probe()
129 	drv_data->wdt.parent = dev;  in menf21bmc_wdt_probe()
130 	drv_data->i2c_client = i2c_client;  in menf21bmc_wdt_probe()
133 	 * Get the current wdt timeout value from the BMC because  in menf21bmc_wdt_probe()
136 	bmc_timeout = i2c_smbus_read_word_data(drv_data->i2c_client,  in menf21bmc_wdt_probe()
139 		dev_err(dev, "failed to get current WDT timeout\n");  in menf21bmc_wdt_probe()
143 	watchdog_init_timeout(&drv_data->wdt, bmc_timeout / 10, dev);  in menf21bmc_wdt_probe()
144 	watchdog_set_nowayout(&drv_data->wdt, nowayout);  in menf21bmc_wdt_probe()
145 	watchdog_set_drvdata(&drv_data->wdt, drv_data);  in menf21bmc_wdt_probe()
150 		dev_err(dev, "failed to set Watchdog bootstatus\n");  in menf21bmc_wdt_probe()
154 	ret = devm_watchdog_register_device(dev, &drv_data->wdt);  in menf21bmc_wdt_probe()
158 	dev_info(dev, "MEN 14F021P00 BMC Watchdog device enabled\n");  in menf21bmc_wdt_probe()
167 	i2c_smbus_write_word_data(drv_data->i2c_client,  in menf21bmc_wdt_shutdown()
181 MODULE_DESCRIPTION("MEN 14F021P00 BMC Watchdog driver");